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am3517 pwm

Hi All,
I want to generate  pulses on GPTimer11. But I am not able to generate it.
I did not find any available driver for PWM. I configure gpio179-182 (GPTimer8--11)in mode 2 in uboot,and use the functions in dmtimer.h
But it does not work . Is there any driver is availble for PWM?
What is the exact procedure for generate PWM in sitara?
 
Thanks
Hongsen